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Thread: Brightness control doesn't work

  1. #1
    Join Date
    Nov 2005
    Beans
    59

    Brightness control doesn't work

    Hi All,

    My brightness control isn't working and its burning my eyeballs out, - help!!

    Many thanks

  2. #2
    Join Date
    Jun 2005
    Location
    Toronto, Canada
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    Hidden!
    Distro
    Xubuntu Development Release

    Re: Brightness control doesn't work

    It would be helpful if you could provide some more information. At a base minimum, the make and model of your computer.

    The following information would also be useful:

    1. The video card and driver that you are using. You can get this information by opening a terminal window, entering in the following command and posting back the results:
    Code:
    sudo lspci -vnn | grep -A12 VGA
    2. Any special kernel boot parameters that you may be using:
    Code:
    cat /proc/cmdline
    That should do for starters.

  3. #3
    Join Date
    Nov 2005
    Beans
    59

    Re: Brightness control doesn't work

    Hi Toz,

    No problem. The machine is a Dell XPS One 27. Here is the output:

    Code:
    00:02.0 VGA compatible controller [0300]: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller [8086:0152] (rev 09) (prog-if 00 [VGA controller])
    	Subsystem: Dell Device [1028:054b]
    	Flags: bus master, fast devsel, latency 0, IRQ 52
    	Memory at f7400000 (64-bit, non-prefetchable) [size=4M]
    	Memory at d0000000 (64-bit, prefetchable) [size=256M]
    	I/O ports at f000 [size=64]
    	Expansion ROM at <unassigned> [disabled]
    	Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
    	Capabilities: [d0] Power Management version 2
    	Capabilities: [a4] PCI Advanced Features
    	Kernel driver in use: i915
    	Kernel modules: i915
    
    --
    01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GK107 [GeForce GT 640M] [10de:0fd2] (rev a1) (prog-if 00 [VGA controller])
    	Subsystem: Dell Device [1028:054b]
    	Flags: fast devsel, IRQ 16
    	Memory at f6000000 (32-bit, non-prefetchable) [size=16M]
    	Memory at e0000000 (64-bit, prefetchable) [size=256M]
    	Memory at f0000000 (64-bit, prefetchable) [size=32M]
    	I/O ports at e000 [size=128]
    	Expansion ROM at f7000000 [disabled] [size=512K]
    	Capabilities: [60] Power Management version 3
    	Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
    	Capabilities: [78] Express Endpoint, MSI 00
    	Capabilities: [b4] Vendor Specific Information: Len=14 <?>
    	Capabilities: [100] Virtual Channel

    Code:
    BOOT_IMAGE=/boot/vmlinuz-3.5.0-26-generic root=UUID=c2c89696-4712-46fa-b99c-af9aac981777 ro quiet splash acpi_backlight=vendor vt.handoff=7
    Many thanks

  4. #4
    Join Date
    Jun 2005
    Location
    Toronto, Canada
    Beans
    Hidden!
    Distro
    Xubuntu Development Release

    Re: Brightness control doesn't work

    I notice that you posted in this thread. Where you able to get bumblebee working? Can you switch between the 2 video cards?

    BOOT_IMAGE=/boot/vmlinuz-3.5.0-26-generic root=UUID=c2c89696-4712-46fa-b99c-af9aac981777 ro quiet splash acpi_backlight=vendor vt.handoff=7
    You are using the acpi_backlight=vendor kernel parameter. Is it any better without that parameter? Have you tried any of the following parameters:
    - acpi_osi=
    - acpi_osi=Linux acpi_backlight=vendor
    - acpi_osi=\"!Windows 2012\"

    If neither of those parameters work, you could try directly manipulating the backlight interface to make it more bareable. Run the following command to identify the backlight interfaces and their current values:
    Code:
    cd /sys/class/backlight && grep . */*

  5. #5
    Join Date
    Dec 2011
    Beans
    6

    Re: Brightness control doesn't work

    Hello, I've opened a thread for the same problem in the AB section a week ago, but got no answer. I hope it's ok to post here.

    c/p from my thread:

    I have a typical problem, I can't control the brightness. Neither through the hotkeys or the applet. I've tried the
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor" solution, but it didn't work.


    I'd appreciate if someone could walk me through or point me towards other solutions.

    System details:

    Processor - Intel® Pentium(R) CPU P6200 @ 2.13GHz × 2
    Graphics - VESA: PARK
    OS type - 32-bit"

    video card info
    Code:
    01:00.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee ATI Manhattan [Mobility Radeon HD 5400 Series] [1002:68e0] (prog-if 00 [VGA controller])
        Subsystem: Toshiba America Info Systems Device [1179:fd00]
        Flags: bus master, fast devsel, latency 0, IRQ 46
        Memory at c0000000 (64-bit, prefetchable) [size=256M]
        Memory at d2200000 (64-bit, non-prefetchable) [size=128K]
        I/O ports at 5000 [size=256]
        Expansion ROM at d2240000 [disabled] [size=128K]
        Capabilities: [50] Power Management version 3
        Capabilities: [58] Express Legacy Endpoint, MSI 00
        Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
        Kernel driver in use: fglrx_pci
        Kernel modules: fglrx, radeon
    and the kernel info

    Code:
    Kernel modules: fglrx, radeon
    alan@alan-Satellite-L670:~$ cat /proc/cmdline
    BOOT_IMAGE=/boot/vmlinuz-3.2.0-39-generic root=UUID=c322b63f-4b07-4a33-8889-fdf13bf063b6 ro pcie_aspm=force acpi_backlight=vendor

  6. #6
    Join Date
    Jun 2005
    Location
    Toronto, Canada
    Beans
    Hidden!
    Distro
    Xubuntu Development Release

    Re: Brightness control doesn't work

    @a_m_100, I've replied in your original thread. It would be best to follow-up there for your issue.

  7. #7
    Join Date
    Aug 2005
    Location
    Northern Michigan USA
    Beans
    1,680
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Brightness control doesn't work

    try installing xbacklight set the value you want & then have xbacklight as a startup app

  8. #8
    Join Date
    May 2010
    Location
    Tewkesbury uk
    Beans
    7,510
    Distro
    Ubuntu Development Release

    Re: Brightness control doesn't work

    Hi

    Can you post the output of

    Code:
    ls /sys/class/backlight/
    Kind regards
    Join us on irc at #ubuntuforums. For web chat see here

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  9. #9
    Join Date
    Nov 2005
    Beans
    59

    Re: Brightness control doesn't work

    I'll give those a try. Silly question - when I edit /boot/grub/grub.cfg, - do those parameters actually need a dash in front of them, or is that just your formatting?

    Code:
    root@adam-PC:/boot/grub# cd /sys/class/backlight && grep . */*
    intel_backlight/actual_brightness:4393
    intel_backlight/bl_power:0
    intel_backlight/brightness:4393
    grep: intel_backlight/device: Is a directory
    intel_backlight/max_brightness:4882
    grep: intel_backlight/power: Is a directory
    grep: intel_backlight/subsystem: Is a directory
    intel_backlight/type:raw
    TOZ - In answer to your question, I was not able to get bumblebee working, but have since reinstalled and on the whole, the desktop performance is acceptable on the Intel card. If I want to play games I'll boot into Windows..
    Thank you
    Last edited by sugarat; March 24th, 2013 at 10:19 PM.

  10. #10
    Join Date
    Nov 2005
    Beans
    59

    Re: Brightness control doesn't work

    xbacklight doesn't seem to make any difference. I've tried a number of parameters and the brightness isn't changing..

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